18698939 has 12 divisors (see below), whose sum is σ = 22503600. Its totient is φ = 15473808.

The previous prime is 18698923. The next prime is 18698941. The reversal of 18698939 is 93989681.

It is not a de Polignac number, because 18698939 - 2⁴ = 18698923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18698909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5159 + ... + 8000.

It is an arithmetic number, because the mean of its divisors is an integer number (1875300).

Almost surely, 2^18698939 is an apocalyptic number.

18698939 is a deficient number, since it is larger than the sum of its proper divisors (3804661).

18698939 is a wasteful number, since it uses less digits than its factorization.

18698939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13202 (or 13195 counting only the distinct ones).

The product of its digits is 839808, while the sum is 53.

The square root of 18698939 is about 4324.2269829416. The cubic root of 18698939 is about 265.4232656788.

The spelling of 18698939 in words is "eighteen million, six hundred ninety-eight thousand, nine hundred thirty-nine".